CN109505364B - Self-resetting energy dissipative steel supports with shape memory alloy dampers - Google Patents

Abstract

The invention relates to the technical field of energy dissipation and shock absorption buildings, in particular to a self-reset energy dissipation support with a shape memory alloy damper. The invention includes a core shape memory alloy damper and a cross-shaped steel column, wherein the shape memory alloy damper is composed of two sets of inner and outer sleeves, and a chute is arranged between the inner and outer sleeves so that the two can slide relative to each other according to the track. The sleeves and between the inner sleeve and the outer sleeve are connected by pretensioned superelastic shape memory alloy bars, and the outer end plate of the shape memory alloy damper is connected with the cross-shaped steel column. It is characterized in that, no matter the support is in tension or compression, the device can make the superelastic shape memory alloy bars in tension through the relative sliding of the inner and outer sleeves in the shape memory alloy damper, giving the support stability, Good self-reset and energy dissipation capacity can effectively improve the seismic performance of the building.

Description

Self-resetting energy dissipative steel supports with shape memory alloy dampers

technical field

The invention relates to the technical field of energy dissipation and shock absorption buildings, in particular to a self-reset energy dissipation support with a shape memory alloy damper.

Background technique

Earthquakes are characterized by randomness, suddenness and uncertainty, and are extremely destructive natural disasters. How to effectively reduce the response of engineering structures under dynamic loads such as earthquakes and control the residual deformation of structures, thereby improving the ability of structures to resist natural disasters has always been a research hotspot in the field of civil engineering.

Energy dissipating bracing can improve the lateral stiffness and strength of the frame structure, and can effectively dissipate seismic energy when an earthquake occurs. It is an effective and economical structural form that has been proved by practical engineering. However, traditional supports are prone to buckling under compression, and may exit work early, resulting in insufficient energy dissipation capacity; while new energy dissipation supports such as buckling restraint supports and friction energy dissipation supports can prevent the support members from prematurely withdrawing from work and thus play a better role. Energy consumption capacity, but the permanent deformation after a strong earthquake is not easy to repair, often need to replace the whole root, resulting in waste.

Shape memory alloys have the characteristics of shape memory effect, superelasticity effect, high damping characteristics, etc. Among them, the superelasticity effect is a special hysteretic energy dissipation characteristic, which has the advantages of allowing large deformation and recoverable deformation. The combination of the existing energy-dissipating and shock-absorbing devices can make up for the deficiencies in the performance of some traditional devices, but the asymmetry of the tensile and compressive properties of the shape memory alloy material also brings challenges to its reasonable application.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a self-resetting energy-consuming steel support with a shape memory alloy damper, so as to solve the technical problems of poor energy dissipation and shock absorption and irrecoverable residual deformation of the steel frame support in the prior art.

The purpose of the present invention is achieved through the following technical solutions: the self-resetting energy dissipation support with a shape memory alloy damper includes a shape memory alloy damper and a cross-shaped steel column, wherein the shape memory alloy damper is composed of two sets of square The inner sleeve of the steel pipe, the outer sleeve of the square steel pipe and the superelastic shape memory alloy rib are composed. connected to the building structure.

Further, the outer wall of the inner sleeve is symmetrically provided with a groove-shaped track along a symmetrical axis of the cross-section. It is rectangular; the inner wall of the outer sleeve is provided with a raised rail at the position corresponding to the groove-shaped rail. One side of the sleeve is rectangular; the inner sleeve and the outer sleeve can be connected by a chute and slide relative to each other along the track.

A connecting plate with holes is symmetrically arranged on the outer wall of the inner sleeve on the side close to the supporting end along the other symmetrical axis of the cross section, and the damper inner end plates with holes at four corners are arranged at both ends of the inner sleeve; A connecting plate with holes is symmetrically arranged along the other symmetry axis of the cross section on the side close to the middle of the support; the superelastic shape memory alloy rib I is inserted between the two inner sleeves through the inner end plate of the damper with holes. The two sets of inner sleeve and the outer sleeve are respectively inserted into superelastic shape memory alloy bars II through the connecting plate with holes in the inner sleeve and the connecting plate with holes in the outer sleeve, and they are tensioned and anchored. Make connections.

When the support is not stressed, the pre-tensioned tension on the superelastic shape memory alloy bars makes the inner sleeves and the inner sleeve and the outer sleeve in the component tightly connected without relative movement; when the support is under tension At this time, the cross-shaped steel column and the outer sleeve drive the back movement between the two inner sleeves. At this time, the superelastic shape memory alloy rib I connecting the two inner sleeves is pulled, and the inner sleeve and the outer sleeve are connected. There is no relative movement between the two, so the superelastic shape memory alloy rib II connecting the two is not stressed; when the support is compressed, the inner sleeves are tightly connected without gaps, and the superelastic shape memory alloy rib I inside is not affected. The cross-shaped steel column connects the two outer sleeves and moves relatively along the chute on the inner sleeve, the inner sleeve and the outer sleeve move relative to each other, and the superelastic shape memory alloy bar II connecting the two is pulled .

Compared with the prior art, the beneficial effects of the present invention are:

(1) The steel support composed of the cross-shaped steel column and the shape memory alloy damper has the function of integrating energy dissipation and self-resetting functions, and can exert good hysteretic performance under earthquake action, and will not produce residual after the earthquake. Deformation can greatly reduce the work and cost of post-earthquake repair.

(2) The core shape memory alloy damper uses two sets of superelastic shape memory bars in the connection between the inner sleeve and the inner sleeve, and the inner sleeve and the outer sleeve. Through the relative movement between the sleeves, the shape memory The material can maintain the tension state when the support is under tension or compression, which can ensure the support has stable, good self-reset and energy dissipation capacity, and effectively improve the seismic performance of the building.

(3) In the present invention, the superelastic shape memory alloy is anchored on the inner end plate by pre-tensioning, and its diameter can be freely selected according to the actual engineering force, without limitation, and the connection is easy.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic perspective view of the assembled shape memory alloy damper.

Figure 3 is a diagram showing the relative position of the cross-sectional chute of the shape memory alloy damper when the support is not stressed.

Figure 4 is a diagram showing the relative position of the cross-sectional chute of the shape memory alloy damper when the support is under tension.

Figure 5 is a diagram showing the relative position of the cross-sectional chute of the shape memory alloy damper when the support is under pressure.

In the figure: 1. Shape memory alloy damper; 2. Cross-shaped steel column; 3. Inner sleeve of square steel pipe; 4. Outer sleeve of square steel pipe; 5. Grooved track; 6. Connecting plate with holes in inner sleeve ; 7. Inner end plate of damper; 8. Raised track; 9. Connection plate with holes in outer sleeve; 10. Superelastic shape memory alloy rib I; 11. Superelastic shape memory alloy rib II; 12. Cross-shaped Steel column end plate; 13. Semicircular connecting plate with bolt holes.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

As shown in FIG. 1, a self-reset energy dissipation support with a shape memory alloy damper of the present invention includes a shape memory alloy damper 1 and a cross-shaped steel column 2, an end plate 12 on one side of the cross-shaped steel column and a shape memory alloy The alloy damper square steel tube outer sleeve 4 is connected, and the semicircular connecting plate 13 with bolt holes at the other end is connected with the building structure.

As shown in Figure 2, the shape memory alloy damper 1 is composed of two sets of square steel tube inner sleeve 3, outer sleeve 4 and superelastic shape memory alloy ribs 10, 11; Symmetrically provided with groove-shaped rails 5, the groove-shaped rails 5 are groove-shaped on the side close to the middle of the support, and rectangular on the side close to the end of the support; the outer sleeve 4 is connected with the groove on the inner wall. The position corresponding to the groove-shaped rail 5 is provided with a convex-shaped rail 8. The convex-shaped rail 8 is convex on the side close to the middle of the support, and rectangular on the side close to the end of the support; the inner sleeve 3 and the The outer sleeves 4 can be connected by sliding grooves and slide relative to each other along the track.

The inner sleeve 3 is symmetrically provided with an inner sleeve holed connecting plate 6 on the outer wall of the side close to the support end along another symmetrical axis of the cross section, and both ends of the inner sleeve 3 are provided with four-cornered damper inner end plates with holes. 7; the outer sleeve 4 is symmetrically provided with a connecting plate 9 with holes of the outer sleeve along another symmetrical axis of the cross section on the side close to the middle of the support; the inner end plate of the damper with holes passes between the two inner sleeves 3 The superelastic shape memory alloy bar I10 is penetrated into the middle 7 and the connection is tensioned and anchored; the superelastic shape memory alloy bar II11 is penetrated into the connecting plate with holes of the inner sleeve 6 and the connecting plate 9 with holes of the outer sleeve and is tensioned and anchored. Connect two sets of inner sleeves 3 and outer sleeves 4 respectively.

As shown in Figures 2 and 3, when the support is not stressed, the pre-applied tensile force on the superelastic shape memory alloy bars makes the shape memory alloy damper 1 between the inner sleeve 3, the inner sleeve 3 and the outer sleeve 4 are tightly connected and do not move relative to each other.

As shown in Figures 1 and 4, when the support is under tension, the cross-shaped steel column 2 and the outer sleeve 4 drive the two sections of the inner sleeve 3 to move back and forth. At this time, the superelastic shape connecting the two sections of the inner sleeve 3 The memory alloy bar I10 is under tension, but there is no relative movement between the inner sleeve 3 and the outer sleeve 4, so the superelastic shape memory alloy bar II11 connecting the two is not stressed.

As shown in Figures 1 and 5, when the support is under pressure, the inner sleeves 3 are tightly connected without gaps, the superelastic shape memory alloy bars I10 inside are not stressed, and the cross-shaped steel column 2 connects the two outer sleeves The cylinder 4 moves relatively along the chute on the inner sleeve 3, the inner sleeve 3 and the outer sleeve 4 move relative to each other, and the superelastic shape memory alloy rib II11 connecting the two is pulled.

The above descriptions are only preferred embodiments of the present invention, and should not be construed as limiting the scope of the embodiments of the present invention. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the essential scope of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. A self-reset energy dissipation support with a shape memory alloy damper, comprising a shape memory alloy damper (1) and a cross-shaped steel column (2), characterized in that the shape memory alloy damper (1) is composed of two sets of square The inner sleeve of the steel pipe (3) and the outer sleeve of the square steel pipe (4) are composed; each section of the inner sleeve of the square steel pipe (3) is provided with a damper inner end plate (7) with holes on the inner wall of the sleeve at the end. The connection of the inner sleeves of the two sections of the square steel pipe is realized by penetrating the superelastic shape memory alloy bars I (10) therein, and tensioning and anchoring on the inner end plate (7) of the damper with holes; The sleeve is symmetrically provided with two inner sleeve hole connecting plates (6) on the outer wall of the sleeve at the outer end, and two outer sleeves are symmetrically arranged on the inner wall of the sleeve at the inner end of each section of the square steel tube outer sleeve. The connection plate (9) with holes in the cylinder is connected with the inner sleeve (3) of the square steel pipe and the outer sleeve (4) of the square steel pipe through the connection plate (6) with holes in the inner sleeve and the connection plate with holes in the outer sleeve. The superelastic shape memory alloy bar II (11) is penetrated into the middle of (9) and is tensioned and anchored. One end of the superelastic shape memory alloy bar II (11) is anchored on the connecting plate (6) with holes in the inner sleeve, and the other end is anchored. On the connecting plate (9) with holes of the outer sleeve; the outer sleeve (4) of the square steel pipe of the shape memory alloy damper is connected with the end plate (12) of the cross-shaped steel column, and the cross-shaped steel column (2) is provided with bolts through its ends The semicircular connecting plate (13) of the hole is connected with the building structure. 2. The self-resetting energy-dissipating support with a shape memory alloy damper according to claim 1, characterized in that, grooves are symmetrically provided on the outer wall of the inner sleeve (3) of the square steel pipe along a symmetrical axis of the section The groove-shaped rail (5) is groove-shaped on the side near the middle of the support, and rectangular on the side near the end of the support; The other symmetrical axis is symmetrically provided with an inner sleeve with a hole connecting plate (6), and both ends of the square steel tube inner sleeve (3) are provided with four-cornered damper inner end plates (7) with holes. 3. The self-resetting energy dissipation support with a shape memory alloy damper according to claim 1, wherein the square steel tube outer sleeve (4) corresponds to the groove-shaped track (5) on the inner wall There is a raised track (8) at the position of the stud, the raised track (8) is convex on the side close to the middle of the support, and rectangular on the side near the end of the support; A connecting plate (9) with holes for the outer sleeve is symmetrically arranged along another axis of symmetry of the section. 4. The self-resetting energy-dissipating support with a shape memory alloy damper according to claim 1, wherein the square steel tube inner sleeve (3) and the square steel tube outer sleeve (4) can pass through. The groove-shaped track (5) and the convex-shaped track (8) realize the connection of the chute and slide relatively along the track. 5 . The self-resetting energy dissipation support with a shape memory alloy damper according to claim 1 , wherein the cross-shaped steel column ( 2 ) is provided with a cross shape on the side connected to the shape memory alloy damper ( 1 ). 6 . The steel column end plate (12) is provided with a semicircular connecting plate (13) with bolt holes on the other side. 6 . The self-resetting energy-dissipating support with a shape memory alloy damper according to claim 1 , wherein when the support is not stressed, the preloaded tension on the superelastic shape memory alloy bars makes the shape memory alloy damper In 1, the inner sleeve (3) of the square steel pipe and the inner sleeve (3) of the square steel pipe and the outer sleeve (4) of the square steel pipe are tightly connected and do not move relative to each other; The cross-shaped steel column (2) and the outer sleeve (4) of the square steel pipe drive the inner sleeve (3) of the square steel pipe to move back and forth. At this time, the superelastic shape memory alloy connecting the two inner sleeves (3) of the square steel pipe The rib I (10) is in tension, but there is no relative movement between the inner sleeve (3) of the square steel pipe and the outer sleeve (4) of the square steel pipe, and the superelastic shape memory alloy rib II (11) connecting the two is not stressed ; When the support is under pressure, the inner sleeves (3) of the square steel pipe are tightly connected without gaps, the superelastic shape memory alloy bars I (10) inside are not stressed, and the cross-shaped steel column (2) connects the two sections The square steel pipe outer sleeve (4) moves relatively along the chute on the square steel pipe inner sleeve (3), and the square steel pipe inner sleeve (3) and the square steel pipe outer sleeve (4) move relative to each other, connecting the two The superelastic shape memory alloy bar II(11) is in tension.

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